Air induction means foe internal



Aug. 15, 1933.

A. ROSNER 1,922,640

AIR INDUCTION MEANS FOR INTERNAL COMBUSTION ENGINES Original Filed Dec, 16, 1927 2 Sheets-Sheet 1 g Ll.

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AIR INDUCTION MEANS FOR INTERNAL COMBUSTION ENGINES Original Filed Dec. 16, 1927 2 Sheets-Sheet 2 INVENTOR HDoLPH Pom/2 BY FIG/.2

ATTORNEY Patented Aug. 15, 1933 UNITED STATES AIR INDUCTION MEANS FOR INTERNAL COIVIBUSTION ENGINES Adolph Rosner, Rockton, Ill., assignor to Fairbanks, Morse & 00., Chicago, 111., a Corporation of Illinois I Original application December 16, 1927, Serial No. 240,524. Divided and this application April 6, 1929. Serial No. 353,195

14 Claims.

This invention relates to improvements in air induction means for internal combustion engines, and particularly to a device for silencing the intake suction of an internal combustion engine.

An object of the present invention is to provide means to silence effectively the usual intake air suction noise occurring in an internal combustion engine, and means whereby with the same device, oil and fuel vapor may be reclaimed from the crank case of the engine.

A further object is to provide an internal combustion engine of improved construction, in which the fuel mixer and related parts are completely enclosed within a casing, and which is so constructed and arranged that the chamber is dustproof, and is supplied with clean and preheated intake air.

An additional object is attained in the production of combined means for cooling the oil supply, for example in the crank caseof the engine,

, and for utilizing the heat thus recovered, for preheating the intake air supply of the engine.

A still further object is to provide a device of the class described, which, when employed with an engine'or in a direct connected power plant, is neat and compact in arrangement, and which will provide for a maximum ease of assembly and repair, and is economical to construct and maintain.

Further objects and advantages will appear from the following detailed description of the parts of a preferred embodiment, from the accompanying drawings, and from a copending application filed December 16, 1927, and bearing Serial No. 240,524, of which the present subject matter is a division.

Certain of the reference characters of the drawings are uniform with those appearing in the copending application above noted. The same system of reference characters is used, insofar as practicable, in order better to coordinate the sub ject matter of both the present and the parent applications.

Referring to the drawings, Fig. 1 is a longitudinal section, partially in elevation, of a preferred form of power plant, to which the present improvements are applied, and Fig. 2 is a section along the line 22 of Fig. 1.

It will, of course, be understood that the present detailed description of the parts and the accompanying drawings, relate to a single preferred executional embodiment of the invention, and that substantial changes may be made in the described construction and arrangement of parts,

without departing from the spirit and full inl tendment of this invention.

Referring by numerals to the drawings, 10 designates a crank case which is preferably a casting serving as a frame for the assembly, and on which is mounted a cylinder casting 11. The cylinder casting comprises a power cylinder 12 in which operates a working piston 13 which may be of any suitable form. The cylinder casting is separate from, and carried by the crank case casting, and comprises valve guides 52, which serve to position and determine the path of travel of valves 53. Mounted upon the member 11, and preferably formed separately therefrom, is a cylinder head 16 which is provided with a passageway or opening 54 in communication with a cylinder combustion space.

Operatively associated with the piston 13, is a connecting rod 14, which is pivotally connected with a crank shaft 15, which in turn operates in the usual manner within the crank case, and which may project therethrough as in the present example, to a dynamo electric machine, shown in outline at 55. While by way of illustration, the device is shown as adapted to an internal combustion engine directly connected to a generator, it will, of course, be understood that the present device may be applied equally as well to any internal combustion engine, regardless of its use or power connection.

A control rod 1'? is provided (Fig. 1) which may be actuated, vertically, either by a governor or a hand lever (not shown). This rod serves to actuate an engine throttle valve 20 and a ball-end lever 23, by means of suitable connecting linkage, 0 best seen in Fig. 1. The throttle valve 20 tends to open or close a fuel passage 21, which is formed in a fuel mixer body 43, and thus regulates the amount of fuel mixture admitted to the cylinder. The ball-end lever 23 is so mounted that the lever may be brought to a position where its ball-end greatly restricts the narrow neck of a portion of the Venturi passage 21, thus giving a choking effect for starting the engine. This is effected by the partial or total obstruction of the air passage into the Venturi portion of the passage 21.

A fuel tank 40 is provided into which extends a fuel supply pipe 41, connected with a passage 42 in the fuel mixer body 43.

The passage 42 is in communication with a passage 38, which different plugs 44, with different sized fuel channels therein, provision is made for handling different grades of fuel.

The mixer body 43 and its related parts, is contained in an air tight chamber 45, formed by an enclosing member such as the casting 46. It will be readily seen that this cover 46 provides, preferably, a dust proof enclosing means for the fuel mixer. Intake air is supplied to this chamber, and likewise to the mixer, by an intake air conduit 47, which is of substantial length, being surrounded, and in the present instance entirely enclosed by the crank case. This conduit is in communication with a passage 49, beneath the crank case, and which, like the conduit 47, is of substantial cross-sectional area, and thereby effectively mufiles any appreciable noise incident to the air intake suction of the engine. It will be seen, particularly from Fig. 2 of the drawings, that the conduit 49, beneath the crank case, extends substantially across the base of the case, and that air passing through this conduit, effectively cools the crank case oil supply.

Air for mixture with the fuel in the mixer or carburetor, is drawn through openings 77 in an end cover '76, and this flow of air is regulated by means of a pivoted shutter 78 provided with openings '79, which are so disposed as to register selectively, with the openings 77. This 'air is then drawn beneath the crank case proper into the passage 49, which serves to connect the openings in the end cover '76 with the conduit 47. It will be readily understood that the air openings '77 and 79 serve toform a dust screen tending to prevent foreign particles being drawn into the chamber 45, and therefore into the engine with the fuel mixture.

The conduit 47 also serves as a breather connection between the chamber 45 and the crank case, by means of openings 48 in the wall of the conduit. These openings are so disposed in a portion of the conduit 47 as to be protected from the splash of oil from thecrank case. This protection is afforded by means of a bafile compartment 56 formed above, but in communication with the crank case. It will be readily seen that the openings 48 are disposed within this compartment 56. It will be readily-understood that suction through the tube 47 draws back into the chamber 45, all

unburned gas and oil vapor escaping past the piston into the crank case, and thereby to be taken back into the cylinder with the mixture to be burned.

A number of advantages of the features of construction described above, will be apparent from the description of its parts. In existing'types of internal combustion engines, and especially in those constructed for domestic use, the suction of air incident to the mixture of fuel has been an objectionable source of noise. In this device this noise is effectively muilled by admitting air underneath the crank case through passage 49. into the intake air conduit 47, thence to air tightchamber 45, in which is located the fuel mixer with its accessories, and from which the intake air is obtained by the mixer. Y

It will be apparent that the location of the conduit 47 in the crank case'provides a means for supplying a preheated air to the fuel mixer, thus tending to increase, appreciably, the operating efficiency of the engine. The device further completely eliminates the discharge of noxious gases and smoke directly to the atmosphere, and is therefore particularly adaptable to engines operated indoors. Further, the preferred arrangement provides a neat and compact assembly, and one which is entirely enclosed.

I claim as my invention:

1. In an internal combustion engine, a crank case,'-an air intake conduit having a portion structurally distinct from, and extending through the crank case, and provided with means for fiuid communication with the interior of the crank case chamber.

2. In an internal combustion engine, a carburetor, a crank case adapted to contain a lubricant,an air intake conduit having a portion disposed in a horizontal plane and along a lower wall portion of said crank case, and adapted thereby to cool said lubricant, a further portion of said conduit extending upwardly through the lubricant in said crank case, in cooling relation thereto, said portion being extended above the lubricant and adapted to remove combustible fluid from the crank case. 7

' 3. In an internal combustion engine, an intake silencing device comprising a chamber 5. In an internal combustion'engine, a carburetor, a crank case and an air inlet conduit extending'through the crank case and in fluid communication with the crank chamber, said conduit comprising a portion of substantial width, adapted to cool a body of oil in the crank case.-

6. In combination with an internal combustion engine, a carburetor, a closed crank case, a chamber around said carburetor, and means distinct from the crank case forming a passage extending through said crank case and terminating in said chamber/said passage having. means whereby said conduit is adapted to serve as a breather for said crank case.

7. In an internal combustion engine, including a crank case, a carburetor having an air intake, and an air conduit structurally distinct from the crank case, said conduit communicating with said air intake and extending through the crank case, and means in said conduit providing free communication between said. crank case and said carburetor, and adapted to relieve crank case compression.

8. In an internal combustion engine having a crank case adapted to contain oil, a fuel mixer disposed substantially above the crank case, and an air intake passage directed to said fuel mixer, anddisposed in contact with said crank case substantially throughout the length of said passage, a portion of said passage being below said crank case, and adapted thereby to cool a supply of oil therein.

9. In an internal combustion engine including a crank case adapted 'to contain oil, means for preheating the intake air supply and including an air conduit having a portion extending vertically through and partly surrounded by the oil in said crank case.

10. In an internal combustion engine including a crank case adapted to contain oil, combined means for preheating the intake air supply and cooling the oil in said crank case, said means including a conduit having a vertically disposed portion extending through and adapted to be heated by the oil in said crank case, and another portion disposed horizontally and extending along one Wall of the crank case.

11. In an internal combustion engine including an air inlet and a crank case adapted to contain oil, combined means for heating the intake air supply and cooling said oil, said means including a conduit having a portion extending adjacently along one wall of the crank case, and another portion extending substantially into said crank case and directed to said inlet; and means formed by said conduit for recovering crank case vapors.

12. In an internal combustion engine including a crank case adapted to contain oil, a carburetor, a chamber around said carburetor, a fluid conduit arranged to extend through the oil in said crank case to provide means for preheating a portion of said conduit, and means formed by the conduit, for supplying fluid from said crank case to said chamber.

13. In an internal combustion engine including a crank case adapted to contain oil, a carburetor, a chamber around said carburetor, a fluid conduit, extending substantially through the crank case, and having an opening to permit fluid to enter said conduit from the crank case, and means for preventing the crank case oil from entering said conduit.

14. In an internal combustion engine including a crank case adapted to contain oil, a carburetor, enclosing means adapted to form a chamber for said carburetor, a conduit for supplying intake air to said chamber, said conduit extending through said crank case, and having an opening providing communication between said crank case and chamber, and means for regulating the intake air flow to said conduit.

ADOLPH ROSNER. 

